Flexible trough



FIG. 1 is a front perspective view of a flexible trough with a gate on the front of the flexible trough in a closed position;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a front perspective view of the flexible trough with the gate on the front of the flexible trough in an opened position;

FIG. 9 is a front view thereof;

FIG. 10 is a back view thereof;

FIG. 11 is a left-side view thereof;

FIG. 12 is a right-side view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

The dashed broken lines depict portions of the flexible trough that form no part of the claimed design. 

CLAIM The ornamental design for a flexible trough, as shown and described. 